KR20140062075A - Using non-uniform frequency bands for coexistence among multiple wireless communication technologies - Google Patents

Abstract

An apparatus having corresponding methods and a computer-readable medium includes a first transceiver comprising a controller configured to select a frequency region of a plurality of frequency regions, wherein the bandwidths of the frequency regions are non-uniform and the first transceiver Wherein the controller is configured to transmit and receive first wireless signals in a frequency range selected by the controller according to a first protocol; An arbitrator configured to select one or more frequency channels based on a frequency region selected by the controller from among the plurality of frequency regions; And a second transceiver configured to transmit and receive second wireless signals only on one or more frequency channels selected by the arbiter according to a second protocol.

Description

USING NON-UNIFORM FREQUENCY BANDS FOR COEXISTENCE AMONG MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES FOR COMBINATION BETWEEN A FEW TECHNICAL FIELD [0001]

[Cross reference of related application]

U.S. Patent Application No. 13 / 605,241, entitled " Using Non-Uniform Frequency Bands For Coexistence Among Multiple Wireless Communication Technologies, " filed September 6, 2012, filed on September 14, 2011 U.S. Provisional Patent Application No. 61 / 534,657, entitled " Non-uniform Frequency Operation Region for In-device Co-existence Interference Avoidance, " filed on even date herewith, .

[TECHNICAL FIELD]

The present invention relates generally to the field of wireless communications. In particular, the present invention relates to avoiding interference between several different wireless communication technologies using adjacent or overlapping frequency bands.

The popularity of multiple wireless communication technologies for handheld platforms has made it necessary to integrate multiple wireless communication technologies onto a single wireless communication device. However, the frequency bands of some of these techniques are sufficiently close to result in interference. For example, a non-licensed 2.4 GHz Industrial, Scientific and Medical (ISM) frequency band is adjacent to some of the bands used by mobile wireless standards (MWS) technologies, resulting in adjacent channel interference. In many electronic devices, such as smartphones, both ISM and MWS technologies are implemented in the same device. For example, smartphones can employ Long Term Evolution (LTE) for phone calls, WiFi for local area networking, and Bluetooth for headsets. LTE transmissions from smartphones will cause adjacent channel interference with incoming Bluetooth and WiFi signals. Likewise, Bluetooth and WiFi from smartphones will cause incoming LTE signals and adjacent channel interference. This adjacent channel interference may significantly degrade performance on smartphones as well as on connected MWS base stations.

In general, in an aspect, an embodiment is an apparatus, the apparatus comprising: a first transceiver comprising a controller configured to select a frequency region of a plurality of frequency regions; Wherein the first transceiver is configured to transmit and receive first radio signals in a frequency region selected by the controller from among the plurality of frequency regions according to a first protocol, And a second transceiver configured to transmit and receive second wireless signals only on one or more frequency channels selected by the arbitrator according to a second protocol.

Embodiments of the apparatus may include one or more of the following features. In some embodiments, the first protocol is an MWS protocol and the second protocol is an ISM band protocol. In some embodiments, the first protocol is an ISM band protocol and the second protocol is an MWS protocol. In some embodiments, each of the first protocol and the second protocol is an ISM band protocol. In some embodiments, a frequency region of the frequency regions includes a plurality of frequency sub-regions, and the controller is further configured to select a frequency sub-region of the plurality of frequency sub-regions, Wherein the transceiver is further configured to transmit and receive first radio signals in a frequency sub-region selected by the controller from among the plurality of frequency sub-regions, and wherein the arbiter is configured to select one of the plurality of frequency sub- And to select one or more frequency channels based on the region. In some embodiments, the controller is further configured to provide an information signal, wherein the information signal represents a frequency region selected by the controller from among the plurality of frequency regions, and the arbitrator is operable to provide the information signal And to select one or more frequency channels based thereon. Some embodiments include one or more integrated circuits including the apparatus. Some embodiments include an electronic communication device including the device.

In general, in an aspect, an embodiment is directed to a method, comprising: selecting a frequency region from among a plurality of frequency regions; and determining the bandwidths of the frequency regions to be non-uniform, Transmitting and receiving first radio signals in the frequency domain among the plurality of frequency domains, selecting one or more frequency channels based on the selected frequency domain among the plurality of frequency domains, Transmitting and receiving second wireless signals only on the one or more frequency channels.

Embodiments of the method may include one or more of the following features. In some embodiments, the first protocol is an MWS protocol and the second protocol is an ISM band protocol. In some embodiments, the first protocol is an ISM band protocol and the second protocol is an MWS protocol. In some embodiments, each of the first protocol and the second protocol is an ISM band protocol. Some embodiments include selecting a frequency sub-region from among a plurality of frequency sub-regions, wherein one frequency region of the frequency regions includes the plurality of frequency sub-regions, the plurality of frequency sub- Transmitting and receiving first radio signals in the frequency sub-region among the plurality of frequency sub-regions, and selecting one or more frequency channels based on the frequency sub-region among the plurality of frequency sub-regions. Some embodiments include providing an information signal, wherein the information signal represents the frequency region of the plurality of frequency regions, and selecting one or more frequency channels based on the information signal.

Generally, in one aspect, an embodiment features a computer-readable medium having computer-executable instructions embodied thereon for performing functions in an electronic device, the functions including selecting a frequency region of a plurality of frequency regions Wherein the bandwidths of the plurality of regions are non-uniform and cause the electronic device to transmit and receive first radio signals in the frequency region of the plurality of frequency regions according to a first protocol, Selecting one or more frequency channels based on the frequency domain, and causing the electronic device to transmit and receive second radio signals only on the one or more frequency channels according to a second protocol.

Embodiments of the computer-readable medium may include one or more of the following features. In some embodiments, the first protocol is an MWS protocol and the second protocol is an ISM band protocol. In some embodiments, the first protocol is an ISM band protocol and the second protocol is an MWS protocol. In some embodiments, each of the first protocol and the second protocol is an ISM band protocol. In some embodiments, the functions may include selecting a frequency sub-region from among a plurality of frequency sub-regions, one of the frequency regions including the plurality of frequency sub-regions, - transmitting and receiving first radio signals in the frequency sub-region, and selecting one or more frequency channels based on the frequency sub-region of the plurality of frequency sub-regions. In some embodiments, the functions may include providing an information signal, the information signal indicating the selected one of the plurality of frequency regions, and selecting the one or more frequency channels based on the information signal .

The details of one or more implementations are set forth in the accompanying drawings and the following detailed description. Other features will be apparent from the description and drawings, and from the claims.

1 shows elements of a communication system according to one embodiment.
Figure 2 illustrates schematically how the various channels of one transceiver generate different levels of interference for different channels of another transceiver.
FIG. 3 illustrates exemplary mapping of LTE channels 1 to 5 to frequency regions and sub-regions having non-uniform bandwidths.
4 illustrates a process for the user equipment of FIG. 1 according to an embodiment in which an arbiter assigns WiFi channels to a WiFi MAC based on LTE channels used by an LTE device.
5 illustrates a process for the user equipment of FIG. 1 according to an embodiment in which an arbiter assigns LTE channels to an LTE device based on WiFi channels used by a WiFi MAC.
The head number (s) of each reference numeral used in the present specification indicates the number of the figure in which the reference numerals first appear.

Embodiments of the present invention provide for coexistence between a plurality of wireless communication technologies based on frequency regions used by one or more of the wireless signals, wherein the bandwidths of the frequency regions are non-uniform. In some cases, wireless communication technologies use adjacent frequency bands and thus cause adjacent channel interference. For example, some bands used by MWS techniques are adjacent to the ISM frequency band. In other cases, the interference results from wireless communication technologies that use frequency bands that are partially or completely overlapping. For example, both WiFi and Bluetooth use ISM frequency bands.

FIG. 1 illustrates the elements of communication system 100 in accordance with one embodiment. Although elements of communication system 100 are shown in one configuration in the described embodiments, other embodiments may feature other configurations. For example, elements of communication system 100 may be implemented in hardware, software, or combinations thereof.

Referring to Figure 1, a communication system 100 includes a user equipment (UE) 102 that is capable of communicating using a plurality of radio technologies. The user device 102 may be implemented with any type of electronic device capable of performing the functions described herein. For example, the user device 102 may be implemented as a smartphone, a tablet computer, or the like. The elements of the user device 102 may be implemented as one or more integrated circuits.

The user equipment 102 includes a plurality of transceivers that employ various wireless technologies. In the example of Figure 1, the transceivers include an MWS transceiver and an ISM band transceiver. In other embodiments, other numbers of transceivers and other combinations of wireless technologies may be employed instead. For example, MWS transceivers may include LTE transceivers, Worldwide Interoperability for Microwave Access (WiMAX) transceivers, and the like, and ISM band transceivers include WiFi transceivers, Bluetooth transceivers, ZigBee transceivers, and the like can do. The transceivers may include two MWS transceivers or two ISM transceivers. ISM band devices may also include receive-only devices such as global positioning system (GPS) receivers, frequency-modulated (FM) radio receivers, and so forth.

In the example of FIG. 1, the transceivers include a WiFi medium access controller (MAC) 104 and an LTE device 108. Each transceiver communicates using one or more respective antennas. In particular, the WiFi MAC 104 uses one or more antennas 110 and the LTE device 108 uses one or more antennas 114. In some embodiments, one or more of the antennas 110, 114 may be combined.

The WiFi MAC 104 includes a receiver (WiFi Rx) 116, a transmitter (WiFi Tx) 118 and a WiFi controller 106. The LTE device 108 includes a receiver (LTE Rx) 120, a transmitter (LTE Tx) 122, and an LTE controller 112. The WiFi MAC 104 uses the antenna 110 to transmit and receive wireless WiFi protocol signals 124 (also referred to herein as WiFi signals 124). The LTE device 108 uses the antennas 114 to transmit and receive wireless LTE protocol signals 126 (also referred to herein as LTE signals 126).

The user equipment 102 also includes an arbitrator 128. [ The arbiter 128, LTE controller 112 and WiFi controller 106 may be implemented with one or more processors. Processors in accordance with various embodiments may be fabricated as one or more integrated circuits. The arbiter 128 includes a channel map 138. The channel map 138 may be stored in an internal memory of the arbiter 128 or in a memory external to the arbiter 128 or the like. Intermediary 128 receives information signals 130 and 132 from transceivers 104 and 108 and provides control signals 134 and 136 to transceivers 104 and 108. The arbiter 128 receives the information signals 130 from the WiFi MAC 104 and provides control signals 134 to the WiFi MAC 104. The arbiter 128 receives the information signals 132 from the LTE device 108 and provides control signals 136 to the LTE device 108. In some embodiments, both information signals 130 and 132 and control signals 134 and 136 are not used.

The information signals 130 and 132 each include indications of frequency ranges used by the radio signals 124 and 126. Indications of frequency ranges used by the radio signals 124 and 126 are indicative of the frequency ranges used by the radio signals 124 and 126 received by the receivers 116 and 120, Indications of frequency ranges used by the radio signals 124,126 employed by the transmitters 118,122 that transmit signals 124,126, and so on. The frequency regions may include current frequency regions as well as planned future frequency regions.

In conventional approaches, the bandwidths of the indicated frequency ranges are uniform. For example, the frequency range indication is uniformly distributed over both LTE channels. However, this conventional approach does not take into account the fact that the various channels of one transceiver generate different levels of interference to the different channels of other transceivers of the user equipment 102. Figure 2 diagrammatically illustrates this fact for LTE 20 MHz channels 1 to 5 and WiFi channels 1 to 5. Referring to FIG. 2, each LTE channel has a bandwidth of 20 MHz, and the number of LTE channels increases as the frequency decreases. Each WiFi channel has a bandwidth of 22 MHz, and the number of WiFi channels increases as the frequency increases. In terms of frequency, the closer a LTE channel is to a WiFi channel, the more WiFi transmissions will generate interference in that LTE channel. For example, in terms of frequency, WiFi Channel 1 is much closer to LTE Channel 1 than LTE Channel 5. Therefore, WiFi transmissions on LTE channel 1 will generate more interference on LTE channel 1 than on LTE channel 5. The spectrum for channel 1 is shown at 200 and the out-of-band emissions for LTE channel 1 are shown expanded into WiFi channels 1 and 2.

The described embodiments take this fact into account by mapping channels to frequency regions with non-uniform bandwidths. 3 shows an exemplary mapping of LTE channels 1 to 5 to frequency regions with non-uniform bandwidths. Referring to FIG. 3, LTE channel 1 is mapped to LTE frequency domain 0, and LTE channels 2 to 5 are mapped to LTE frequency domain 1. In this mapping, frequency domains have non-uniform bandwidths, LTE frequency domain 0 has a bandwidth of 20 MHz, and LTE frequency domain 1 has a bandwidth of 80 MHz.

In one embodiment, the information signals 132 inform the arbiter 128 of the LTE frequency domain employed by the LTE device 108. Based on this LTE frequency domain, the arbiter 128 selects one or more WiFi frequency channels available for use by the WiFi MAC 104 and transmits control signals 134 to the one or more available frequency channels To the WiFi MAC 104. For example, the arbiter 128 employs a channel map 138 to select one or more available WiFi frequency channels based on the LTE frequency domain employed by the LTE device 108. Exemplary mappings are shown in Table 1.

LTE frequency domain Available WiFi frequency channels 0 5 - 11 One 2 - 11

In some embodiments, the LTE frequency regions are divided into LTE frequency sub-regions with non-uniform bandwidths. FIG. 3 illustrates an exemplary mapping of LTE channels 1 to 5 to LTE frequency sub-regions with non-uniform bandwidths. 3, LTE channel 1 is mapped to LTE frequency regions 00 and 01, LTE channels 2 to 3 are mapped to LTE frequency sub-region 10, and LTE channels 4 to 5 are mapped to LTE frequency sub- 11 < / RTI > In this mapping, the frequency sub-regions have non-uniform bandwidths, the LTE frequency sub-regions 00 and 01 each have a bandwidth of 10 MHz, and the LTE frequency sub-regions 10 and 11 each have a bandwidth of 40 MHz I have.

In one embodiment, the information signals 132 inform the arbiter 128 of the LTE frequency sub-region employed by the LTE device 108. Based on the LTE frequency sub-region, the arbiter 128 selects one or more WiFi frequency channels available for use by the WiFi MAC 104, and uses the control signals 134 to determine the one or more available Frequency channels to the WiFi MAC 104. For example, the arbiter 128 employs a channel map 138 to select one or more available WiFi frequency channels based on the LTE frequency sub-region employed by the LTE device 108. An exemplary mapping is shown in Table 2.

LTE frequency sub-region Available WiFi frequency channels 00 5 - 11 01 3 - 11 10 2 - 11 11 1 - 11

Similar mappings may be used for other types of transceivers. For example, in some embodiments, the user equipment 102 includes a Bluetooth transceiver, and the arbiter 128 may select an available Bluetooth frequency channel based on the LTE frequency sub-region employed by the LTE device 108 Lt; RTI ID = 0.0 > 138 < / RTI > An exemplary mapping is shown in Table 3.

LTE frequency sub-region Available Bluetooth frequency channels 00 21 - 79 01 11 - 79 10 6 - 79 11 1 - 79

In some embodiments, the arbiter 128 uses the channel map 138 to assign channels to the WiFi MAC 104 as described above. In other embodiments, the arbiter 128 may be used in other ways, for example, by using programmable thresholds or frequency offsets to provide sufficient frequency gaps between LTE and WiFi operating regions And may assign channels to the WiFi MAC 104. Notably, the mappings, regions and sub-regions of Figure 3 and Tables 1 to 3 are only shown by way of example. Other embodiments may feature other mappings, regions, and sub-regions.

4 illustrates a process for user equipment 102 of FIG. 1 according to an embodiment in which arbiter 128 allocates WiFi channels to WiFi MAC 104 based on LTE channels used by LTE device 108 FIG. Although the elements of process 400 are presented in one configuration in the described embodiments, other embodiments may feature other configurations. For example, in various embodiments, some or all of the elements of process 400 may be executed in a different order, at the same time, and so on. Also, some elements of process 400 may not be performed, and other elements may not be executed immediately after an element is executed. Additionally, some or all of the elements of process 400 may be performed automatically, that is, without human intervention.

4, in step 402, the LTE controller 112 selects one of a plurality of LTE frequency regions or sub-regions, wherein the bandwidths of the frequency regions or sub-regions are non-uniform . The LTE frequency domain or sub-region may be assigned to the LTE device 108 by a base station, also referred to as an eNB or eNodeB (eNodeB). Subsequently, at step 404, the LTE device 108 transmits and receives wireless signals 126 in the selected frequency domain or sub-domain according to the LTE protocol.

At step 406, the LTE controller 112 informs the arbiter 128 of the selected LTE frequency domain or sub-domain. In particular, the LTE controller 112 provides an information signal 132, which represents a selected LTE frequency domain or sub-domain. For example, information signal 132 may include the LTE frequency domain or sub-domain listed in Tables 1 and 2 above. In step 408, in response to the information signal 132, the arbiter 128 selects available WiFi frequency channels based on the information signal 132, for example, as described above. At step 410, the arbiter 128 informs the WiFi MAC 104 of the selected WiFi frequency channels. In particular, arbiter 128 provides control signal 134, which indicates the selected WiFi frequency channels. In step 412, the WiFi MAC 104 then sends and receives WiFi signals 124 on one or more of the selected WiFi frequency channels.

The techniques described herein may also be used by arbiter 128 to select available LTE channels based on the WiFi channel used by the WiFi MAC 104. 5 illustrates a process for user equipment 102 of FIG. 1 according to an embodiment in which arbiter 128 allocates LTE channels to LTE device 108 based on WiFi channels used by WiFi MAC 104 FIG. Although the elements of process 500 are presented in one configuration in the described embodiments, other embodiments may feature other configurations. For example, in various embodiments, some or all of the elements of process 500 may be executed in different orders, simultaneously and so on. In addition, some elements of process 500 may not be performed, and other elements may not be executed immediately after an element is executed. Additionally, some or all of the elements of process 500 may be performed automatically, that is, without human intervention.

Referring to FIG. 5, in step 502, the WiFi controller 106 selects one of a plurality of WiFi frequency regions or sub-regions, and the bandwidths of the frequency regions or sub-regions are non-uniform. WiFi frequency regions or sub-regions may be mapped to WiFi channels in a manner similar to that shown for the LTE channels of FIG. Subsequently, at step 504, the WiFi MAC 104 transmits and receives wireless signals 124 in the selected frequency domain or sub-domain according to the WiFi protocol.

At step 506, the WiFi controller 106 informs the arbiter 128 of the selected WiFi frequency domain or sub-domain. In particular, the WiFi controller 106 provides an information signal 130, which represents a selected WiFi frequency domain or sub-domain. In step 508, in response to the information signal 130, the arbiter 128 may determine, based on the information signal 130, for example, the availability of available WiFi channels in a manner similar to that described above, Selects one LTE frequency channel. At step 510, the arbiter 128 informs the LTE device 108 of the selected LTE frequency channels. In particular, arbiter 128 provides control signal 136, which indicates the selected LTE frequency channels. At step 512, the LTE device 108 transmits and receives LTE signals 126 on one or more selected LTE frequency channels.

Various embodiments are characterized by one or more of the following advantages. From the point of view of an LTE base station, the downlink resource is prevented from engaging in unsuccessful transactions resulting from potentially high interference with WiFi transmissions from the user equipment 102. Thus, the downlink resources can be used for other user equipment 102, resulting in improved resource utilization efficiency for the base station. From the point of view of the WiFi devices of the user device 102, the WiFi receiving resources are faced away from non-successful receiving transactions resulting from potentially high interference with LTE uplink packets. It should be noted that these advantages are achieved without changing the existing 3GPP LET standards.

Various embodiments of the present invention may be implemented in digital electronic circuitry or computer hardware, firmware, software, or combinations thereof. Embodiments of the invention may be implemented as computer programs stored in a computer-readable storage device for execution by a programmable processor. The described processes may be performed by a programmable processor executing a program of instructions that causes the computer to perform functions by operating on input data and generating an output. Embodiments of the present invention provide a method and system for processing data on a programmable system including at least one programmable processor coupled to receive data and instructions from a data storage system, at least one input device, and at least one output device, And may be implemented as one or more computer programs executable. Each computer program may be implemented in a high-level procedural or object-oriented programming language or, if desired, in assembly or machine language, and in some cases such language may be a compiled or interpreted language. Suitable processors include, by way of example, both general purpose and special purpose microprocessors. Generally, processors receive instructions and data from read-only memory and / or random access memory. Generally, a computer includes one or more mass storage devices for storing data files. Such devices include magnetic disks such as internal hard disks and removable disks, magneto-optical disks, optical disks, and solid-state disks. Storage devices suitable for storing computer program instructions and data in a type include, for example, semiconductor memory devices such as EPROM, EEPROM, and flash memory devices, magnetic disks such as internal hard disks and removable disks, Optical disks, and non-volatile memory including CD-ROM disks. Either of these can be replaced by application-specific integrated circuits (ASICs) or integrated into ASICs.

A number of implementations have been described. Nevertheless, various modifications may be made without departing from the scope of the present invention. Accordingly, other implementations are within the scope of the following claims.

Claims (20)

As an apparatus,
A first transceiver comprising a controller configured to select a frequency region of a plurality of frequency regions, wherein the bandwidths of the frequency regions are non-uniform, and wherein the first transceiver, Wherein the controller is configured to transmit and receive first wireless signals in a frequency range selected by the controller;
An arbiter configured to select one or more frequency channels based on the frequency region selected by the controller from among the plurality of frequency regions; And
And a second transceiver configured to transmit and receive second wireless signals only on one or more frequency channels selected by the arbiter according to a second protocol. The method according to claim 1,
Wherein the first protocol is a Mobile Wireless Standard (MWS) protocol; And
Wherein the second protocol is an Industrial, Scientific and Medical (ISM) band protocol. The method according to claim 1,
The first protocol is an ISM band protocol; And
Wherein the second protocol is an MWS protocol. The method according to claim 1,
Wherein each of the first protocol and the second protocol is an ISM band protocol. The method according to claim 1,
One frequency region of the frequency regions including a plurality of frequency sub-regions;
The controller is further configured to select a frequency sub-region of the plurality of frequency sub-regions;
Wherein the first transceiver is further configured to transmit and receive the first radio signals in a frequency sub-region selected by the controller from among the plurality of frequency sub-regions; And
Wherein the arbiter is further configured to select the one or more frequency channels based on a frequency sub-region selected by the controller from among the plurality of frequency sub-regions. The method according to claim 1,
Wherein the controller is further configured to provide an information signal, wherein the information signal represents a frequency region of the plurality of frequency regions selected by the controller; And
Wherein the arbiter is further configured to select the one or more frequency channels based on the information signal provided by the controller. One or more integrated circuits comprising the apparatus of claim 1. An electronic communication device comprising the device of claim 1. As a method,
Selecting a frequency region of the plurality of frequency regions, wherein the bandwidths of the frequency regions are non-uniform;
Transmitting and receiving first radio signals in the frequency domain among the plurality of frequency domains according to a first protocol;
Selecting one or more frequency channels based on the selected frequency domain among the plurality of frequency domains; And
And transmitting and receiving second wireless signals only in the one or more frequency channels according to a second protocol. 10. The method of claim 9,
The first protocol is an MWS protocol; And
Wherein the second protocol is an ISM band protocol. 10. The method of claim 9,
The first protocol is an ISM band protocol; And
Wherein the second protocol is an MWS protocol. 10. The method of claim 9,
Wherein each of the first protocol and the second protocol is an ISM band protocol. 10. The method of claim 9,
Selecting a frequency sub-region from among a plurality of frequency sub-regions, wherein a frequency region of the frequency regions comprises the plurality of frequency sub-regions;
Transmitting and receiving the first radio signals in the frequency sub-region among the plurality of frequency sub-regions; And
Selecting one or more frequency channels based on the frequency sub-region of the plurality of frequency sub-regions. 10. The method of claim 9,
Providing an information signal, wherein the information signal represents the frequency region of the plurality of frequency regions; And
And selecting the one or more frequency channels based on the information signal. 43. A computer-readable medium embodying instructions executable by a computer to perform functions in an electronic device,
The functions include:
Selecting a frequency region of the plurality of frequency regions, wherein the bandwidths of the frequency regions are non-uniform;
Causing the electronic device to transmit and receive first radio signals in the frequency domain of the plurality of frequency domains, according to a first protocol;
Selecting one or more frequency channels based on the frequency domain among the plurality of frequency domains; And
And causing the electronic device to transmit and receive second wireless signals only in the one or more frequency channels according to a second protocol. 16. The method of claim 15,
The first protocol is an MWS protocol; And
RTI ID = 0.0 > 1, < / RTI > wherein the second protocol is an ISM band protocol. 16. The method of claim 15,
The first protocol is an ISM band protocol; And
And wherein the second protocol is an MWS protocol. 16. The method of claim 15,
Wherein each of the first protocol and the second protocol is an ISM band protocol. 16. The method of claim 15,
The functions include:
Selecting a frequency sub-region from among a plurality of frequency sub-regions, wherein a frequency region of the frequency regions comprises the plurality of frequency sub-regions;
Transmitting and receiving the first radio signals in the frequency sub-region among the plurality of frequency sub-regions; And
And selecting the one or more frequency channels based on the frequency sub-region of the plurality of frequency sub-regions. 16. The method of claim 15,
The functions include:
Providing an information signal, wherein the information signal represents the selected one of the plurality of frequency regions; And
And selecting the one or more frequency channels based on the information signal.

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